Achromatism: alternatives and connections

The convergence to different foci, by a lens or mirror, of rays of light emanating from one and the same point, or the deviation of su…

In an achromatic manner.

To deprive of color; to make achromatic.

Colorless; achromatic.

An instrument for viewing pictures by means of a lens, so as to present them in their natural proportions and relations.

Uniting the chemical rays of light into one focus, as a certain kind of lens; amacratic.

The achromatic figure, formed in mitotic cell-division, consisting of two asters connected by a spindle-shaped bundle of rodlike fiber…

An anomalous state of refraction caused by the absence of the crystalline lens, as after operations for cataract. The remedy is the us…

Having two or more parts of different curvatures, so combined as to remove spherical aberration; -- said of a lens.

A defect of the eye or of a lens, in consequence of which the rays derived from one point are not brought to a single focal point, thu…

Convex on both sides; as, a biconvex lens.

A globule of air, or globular vacuum, in a transparent solid; as, bubbles in window glass, or in a lens.

A lantern, with a thick glass lens on one side for concentrating the light on any object; also, the lens itself.

An apparatus in which the images of external objects, formed by a convex lens or a concave mirror, are thrown on a paper or other whit…

A membranous sac containing fluid, or investing an organ or joint; as, the capsule of the lens of the eye. Also, a capsulelike organ.

An opacity of the crystalline lens, or of its capsule, which prevents the passage of the rays of light and impairs or destroys the sig…

The state of being colored, as in the case of images formed by a lens.

A tube having a convex lens at one end and at the other a small opening or slit which is at the principal focus of the lens, used for…